“Cascade if can be replaced with when” warning but sometimes it’s a false positive, for example if I...

# android

[Mark]

“Cascade if can be replaced with when” warning but sometimes it’s a false positive, for example if I have an if condition (at least 3 branches) where the checks are things like Build.VERSION.SDK_INT > 12 and then branch depends on such a later SDK level. How to suppress this warning?
Thread in Slack Conversation

[Mark]

@kenkyee how is this “not kotlin”? It’s literally only relevant to Kotlin as a language, and Android as a platform.

[kenkyee]

It's a lint bug. Write the same thing in Java and you'll get the same issue...

[Mark]

Do you mean a switch statement?

[kenkyee]

Or an if else tree as well. Or if you use a method to do the check.
It's just a buggy lint rule you end up suppressing half the time...

[Mark]

This is specifically about a when statement showing a compilation error when the equivalent if statement does not. How do you propose you write this in Java to get the same error?

val capture = when {
    Build.VERSION.SDK_INT < Build.VERSION_CODES.R -> "fallback"
    else -> requires30() // compile-time error "Call requires API level 30 (current min is 23): requires30"
}

@RequiresApi(30)
fun requires30() {}

In other words, I think this is specifically to do with the (Lint perhaps) parsing of the when statement in Kotlin, rather than some language-independent thing.

[kenkyee]

Lint is actually part of AGP.
File a bug at b.android.com with a reproducer

[Mark]

As linked in the original thread: https://issuetracker.google.com/issues/189459502
I still don’t understand how you think this is not Kotlin-specific.